We write *something*, not necessarily what is right.

Starting with attachment 361335 [details], an XL generated contour graph.

I have fixed up axis import and it looks mostly right.  Series, not so much.

There are 4 <c:ser> tags in the file.  We seem to want only one series.
I am not sure what that is about.

# xmllint --format xl/charts/chart1.xml | egrep '</?(c:ser|c:f)>'
        <c:ser>
              <c:f>Sheet1!$B$2:$B$2</c:f>
              <c:f>Sheet1!$C$1:$J$1</c:f>
              <c:f>Sheet1!$C$2:$J$2</c:f>
        </c:ser>
        <c:ser>
              <c:f>Sheet1!$B$3:$B$3</c:f>
              <c:f>Sheet1!$C$1:$J$1</c:f>
              <c:f>Sheet1!$C$3:$J$3</c:f>
        </c:ser>
        <c:ser>
              <c:f>Sheet1!$B$4:$B$4</c:f>
              <c:f>Sheet1!$C$1:$J$1</c:f>
              <c:f>Sheet1!$C$4:$J$4</c:f>
        </c:ser>
        <c:ser>
              <c:f>Sheet1!$B$5:$B$5</c:f>
              <c:f>Sheet1!$C$1:$J$1</c:f>
              <c:f>Sheet1!$C$5:$J$5</c:f>
        </c:ser>


We have everything in one clump:

                <GogObject role="Series">
                  <property name="fill-type">y-origin</property>
                  <property name="interpolation">linear</property>
                  <property name="style" type="GogStyle">
                    <line auto-dash="1" auto-width="1" auto-color="0" color="33:33:33:FF"/>
                  </property>
                  <property name="id">1</property>
                  <data>
                    <dimension id="0" type="GnmGODataVector">Sheet1!$C$1:$J$1</dimension>
                    <dimension id="1" type="GnmGODataVector">Sheet1!$B$2:$B$5</dimension>
                    <dimension id="2" type="GnmGODataMatrix">Sheet1!$C$2:$J$5</dimension>
                  </data>
                </GogObject>

We don't need to have only one series if we use an XLContourPlot compatible with the way XL plays with surfaces and contours.

Thanks.

I have switched to XLContourPlot and patched up axes import for that too.
I end up with...

** (/home/welinder/gnome/gnumeric/src/.libs/lt-gnumeric:9644): WARNING **: Series with no valid style in legend? Please file a bug report.

...and nothing showing in the graph area.  Still debugging.

That warning is bug #788861.

> That warning is bug #788861.

It's the same warning, but the patch does not fix it -- possible because
this is a contour plot whereas the one in bug 788861 is a surface plot.

I guess we should have the same patch for xl_contour_plot_class_init.

No, we should not need the same patch since XLContourPlot derives fom GogContourPlot where the foreach_elem method is already implemented. The warning looks weird to me. I'll have a look.

Fixed the plot rendering.

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